The Seco Silver Prism Assembly 6402-04-YLB provides all the features surveying professionals need in the way of precision and reliability. This prism assembly has a silver-coated canister prism with a 62 millimeter diameter, 0/-30 millimeter offset, and less than 5 arc second accuracy. With silver coating and a plastic canister, this prism assembly easily locks out moisture and will not fog. Attached to the prism and holder is a highly visible yellow and black tilting aluminum target. The steel holder mounts the prism and target to a height of 115 mm, making it ideal for the Nikon Nivo series of total stations. It has a front locking clamp, and its 5/8 x 11-inch thread ideal for prism pole mounting.